Sale 1:

https://backpack.tf/profiles/76561198092509893#!/compare/1520726400/1520812800

https://backpack.tf/profiles/76561198089602477#!/compare/1520726400/1520812800

Sold for 14 keys + Genuine Dread Hood(14 ref)

Total is 14.43 keys

Sale 2:

https://backpack.tf/profiles/76561198125791160#!/compare/1517529600/1517616000 Seller

https://backpack.tf/profiles/76561198393102985#!/compare/1517616000/1517788800 Seller 2

https://backpack.tf/profiles/76561198083796225#!/compare/1515024000/1517702400 Buyer

Sold for 20 pure. (This sale can be traced by looking at Seller 2, keys there went from Buyer -> Seller 2 -> Seller)

Sale 3:

https://backpack.tf/profiles/76561198062859354#!/compare/1516320000/1516406400

https://backpack.tf/profiles/76561198151343629#!/compare/1516147200/1516406400

Sold for N&B Prancer's + Steaming OMA + 1.87 keys in sweets

Unusuals were QS for 8 keys and 9 keys.

For the sake of suggestion, going with those prices.

Total is 9 + 8 + 1.87 = 18.87 keys

Sale 4:

https://backpack.tf/profiles/76561198063640894#!/compare/1517011200/1517097600

https://backpack.tf/profiles/76561198132024160#!/compare/1517011200/1517097600

Sold for Duped Stormy Ball Cap + 1 key

Sold the hat immediately for 17 pure. Going with that price, as the person obviously planned on doing that.

Total is 18 keys.

Sale 5:

https://backpack.tf/profiles/76561198081793950#!/compare/1520726400/1520812800

https://backpack.tf/profiles/76561198057747574#!/compare/1520726400/1520812800

Bulk.

Sale 6:

https://backpack.tf/profiles/76561198310144372#!/compare/1518652800/1518739200

https://backpack.tf/profiles/76561198400940996#!/compare/1518480000/1518912000

Untraceable, assumption can be made it sold for 17 keys, however keys came from Scammer Alt, not using.

Total sales :

14.43, 18, 18.87, 20.

Calling 14.43 an outlier, using 18 - 20 keys.